ethicalconundrum great argumentation . If I unserstand you correctly y, one guy f..cked up , a hero saved he day , congratulations to the Fedex in the end ( litterally on the frequency) so problem solved . Are you a pilot ? Do you understand how safety procedures are made ?
Hans explained it already
But since you like cheese let's go back to it : first cheese layer the Controller made a (big) error in lining up the SW under LVP when the Fedex was inside the OM . But all the next cheese layers built into the sytem failed and the holes were aligned. SW accepting the clearance,and delayed the take off , Fedex not challenge the initial clearance , and then a few more holes afterwards also were aligned . .
I recall, FDX did challenge it, yes?
No he did not challenge the line up clerance, he accepted it , Listen to the R/T , he knew he was 3 NM out and got the traffic info on the SW. and continued CAT III. What he questionned later is if he was still clear to land. . A very different question , especially under LVP. Ops.
We build an ATC system that should be resilient to a single failure , but here all partners failed their bit after the first error was made. That is the whole point of this dicussion , we'll maybe know more later if the NTSB does its job correctly, which until recently they were...
I am not looking for assigning blames to individuals , just to understand
why all layers failed. Also the first one.